CN113362980A - Chromium-zirconium-copper alloy contact wire and preparation method and application thereof - Google Patents
Chromium-zirconium-copper alloy contact wire and preparation method and application thereof Download PDFInfo
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- H—ELECTRICITY
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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Abstract
The invention discloses a chromium-zirconium-copper alloy contact wire and a preparation method and application thereof, wherein the preparation method comprises the following steps: the raw materials are subjected to down-leading semi-continuous casting, forging, hot rolling, solution heat treatment, cold rolling, scalping, aging heat treatment and cold drawing; wherein the raw materials comprise the following components in percentage by mass: 0.2-1.0% of Cr, 0.02-0.2% of Zr and the balance of Cu; zr is added in the form of copper-zirconium intermediate alloy; the down-drawing semi-continuous casting comprises the following steps: smelting Cr and Cu to obtain molten liquid, wherein the smelting temperature is 1150-1300 ℃; then adding the copper-zirconium intermediate alloy into the molten liquid, and casting and down-drawing to obtain a chromium-zirconium-copper cast ingot; the hot rolling temperature is 800 ℃ and 950 ℃; in the cold rolling step, the cross-section deformation of the cold-rolled material is more than 48%. The method can continuously produce the chromium-zirconium-copper alloy contact line for the electrified railway with various performances meeting the standard, and meets the requirement that no welding point exists.
Description
Technical Field
The invention relates to a chromium-zirconium-copper alloy contact wire and a preparation method and application thereof.
Background
Railway transportation bears about 70% of the national passenger and freight transportation volume, and the development of high-speed railways to relieve the transportation pressure of the existing railways becomes an important development trend at present. The high-speed railway has higher requirements on the contact line for electric conduction, and the traditional ladle aluminum line is difficult to meet the current situation, so various copper and copper alloy contact lines become the direction of alternative selection. The alloy type of the contact line has a great influence on the performance of the contact line, and the manufacturing process of the contact line is one of important factors influencing the application performance of the contact line.
At present, the contact line materials commonly used include pure copper, copper tin, copper silver, copper magnesium and the like, and the production process is relatively mature. However, the above materials have limitations, and pure copper, copper silver and copper tin are difficult to adapt to railway network cables with higher speed per hour and worse environment due to lower strength, while copper magnesium has lower conductivity and is only over 64% IACS, which causes great waste of energy.
Chromium zirconium copper is also beginning to be one of the materials for contact wires for railway network lines due to its superior combination of high strength, high conductivity, etc., and in 2017, chromium zirconium copper is also written in the specification of TB/T2809-. However, due to the particularity of the material of the chromium zirconium copper contact wire, the material requires a high-strength high-conductivity ultra-long wire, no suitable process is available at present for producing the qualified chromium zirconium copper contact wire in batch, some preparation methods have limitations, the wire is difficult to produce in continuous batch, the cost is high, or some performances (such as grain size or strength inconsistency, easy material breakage and the like) are difficult to meet the industrial standard. Therefore, it is important to develop a process method for making a contact line of chromium, zirconium and copper with satisfactory properties, which can be continuously mass-produced.
Disclosure of Invention
The invention aims to overcome the defects that the preparation of a chromium-zirconium-copper contact line in the prior art is difficult to realize continuous batch production and good product performance, and provides a chromium-zirconium-copper alloy contact line and a preparation method and application thereof. The preparation method provided by the invention can be used for producing the chromium-zirconium-copper alloy contact wires with excellent performance in batch.
The invention solves the technical problems through the following technical scheme:
a preparation method of a chromium-zirconium-copper alloy contact line comprises the following steps:
the raw materials are subjected to down-leading semi-continuous casting, forging, hot rolling, solution heat treatment, cold rolling, scalping, aging heat treatment and cold drawing; wherein the content of the first and second substances,
the raw materials comprise the following components in percentage by mass: 0.2-1.0% of Cr, 0.02-0.2% of Zr and the balance of Cu; the Zr is added in the form of copper-zirconium intermediate alloy;
the downward drawing semi-continuous casting comprises the following steps: smelting the Cr and the Cu to obtain molten liquid, wherein the smelting temperature is 1150-1300 ℃; then adding the copper-zirconium intermediate alloy into the molten liquid, and carrying out casting and down-drawing casting to obtain a chromium-zirconium-copper cast ingot;
in the step of hot rolling, the temperature of the hot rolling is 800-950 ℃;
in the cold rolling step, the cross-section deformation of the cold-rolled material is more than 48%.
In the present invention, the Cr may be added in the form of a chromium source as is conventional in the art, for example, in the form of metallic chromium.
In the present invention, the Cu may be added in the form of a copper source conventional in the art, for example, in the form of an electrolytic copper plate.
In the present invention, the copper-zirconium master alloy is preferably a copper-zirconium master alloy having a zirconium content of 30 to 50%, such as a CuZr30 master alloy or a CuZr50 master alloy, more preferably a CuZr50 master alloy.
In the present invention, the mass percentage of Cr is preferably 0.8 to 0.9%, for example, 0.878%.
In the present invention, the mass percentage of Cu is preferably 98 to 99%, for example 98.92% or 98.952%. The mass of Cu in the raw material is partly derived from the mass of copper in the copper zirconium master alloy.
In the present invention, the mass percentage of Zr is preferably 0.17 to 0.18%.
In the present invention, the down-drawing semi-continuous casting preferably includes the steps of: the melting temperature is 1230 ℃. During casting, if the smelting temperature is not properly selected, defects such as air holes, cracks, inclusions and the like can be formed in the cast ingot, and the defects can form broken lines when chromium-zirconium-copper alloy contact lines are produced subsequently. If the Cr and the Cu are added together with the copper-zirconium master alloy, zirconium volatilization is caused, and the content of zirconium in the product is difficult to control.
In the present invention, in the down-drawing semi-continuous casting, the temperature during casting is preferably 1100 to 1300 ℃, more preferably 1200 ℃.
In the invention, large-size chromium-zirconium-copper alloy cast ingots can be cast by downward semi-continuous casting. The equipment used for the down-casting semi-continuous casting can be a down-casting semi-continuous casting furnace which is conventional in the field, and generally can comprise a heating furnace, a crystallizer, a down-casting machine and the like. Wherein the melting and casting may be performed in a heating furnace, and the down-casting may be performed by a down-casting machine in cooperation with a crystallizer. The casting temperature is the temperature in the heating furnace during the down-casting process, and is generally slightly lower than the temperature when the Cr and the Cu are smelted.
In the present invention, the forging temperature is preferably 850-.
In the present invention, the apparatus used for forging is preferably a forging press.
In the invention, the size of the material obtained after forging is preferably 210mm × 210mm, and the shape of the material obtained after forging is preferably a square ingot, and more preferably a square ingot with an edge with an inverted R20 round corner. Improper forging dimensions can result in heating and rolling difficulties in subsequent hot rolling.
In the present invention, it is preferable to include a step of milling a surface after the forging and before the hot rolling to ensure that the surface is free of defects. The equipment used for milling can be milling equipment conventional in the art, such as a planer milling machine. The cross-sectional dimension of the material obtained after face milling is preferably 200mm x 200 mm.
In the present invention, the temperature of the hot rolling is preferably 850-. The material is overheated and overburnt due to overhigh temperature, and the material is broken during rolling; if the temperature is too low, defects such as cracks and the like can be formed, and the wire breakage can be caused in the subsequent cold rolling and drawing processes.
In the present invention, the hot rolling equipment may be equipment conventionally used in the art for hot rolling, such as a hot rolling mill. The number of passes of the hot rolling is preferably 20 to 30, more preferably 22.
In the present invention, the hot rolling is preferably performed to obtain a chromium zirconium copper rod, and the diameter of the chromium zirconium copper rod is preferably 28 to 35 mm, and more preferably 28 to 28.2 mm. Too large a size after hot rolling will cause too large a subsequent cold rolling deformation, resulting in low elongation of the final wire rod. The excessively small size after hot rolling results in insufficient subsequent cold rolling deformation and insufficient strength of the final alloy.
In the present invention, the hot rolling preferably includes a step of heating. The heating operation may be a heating operation conventional in the art. The heating apparatus may be conventional in the art, such as a walking beam furnace.
In the present invention, a step of rolling may be further included after hot rolling and before solution heat treatment as is conventional in the art. The winding operation may be a winding operation as conventional in the art, and the diameter of the wound material roll is preferably 1400 mm and 1800 mm, and more preferably 1500 mm.
In the present invention, the solution heat treatment may be a solution heat treatment operation which is conventional in the art. Wherein, the temperature in the solution heat treatment may be a temperature of solution heat treatment conventional in the art, preferably 970 ℃ ± 20 ℃. The solution heat treatment comprises a step of heat preservation, and the heat preservation time can be the heat preservation time conventional in the field, and is preferably 1-1.5 h.
In the present invention, the number of cold rolling is preferably 6 to 12, more preferably 8.
In the present invention, the diameter of the cold-rolled material is preferably 20 to 25 mm.
In the present invention, the cross-sectional deformation of the cold-rolled material generally means:
cross-sectional deformation = (cross-sectional area of material obtained after hot rolling-cross-sectional area of material obtained after cold rolling)/cross-sectional area of material obtained after hot rolling
In the invention, the cross-sectional deformation of the cold-rolled material is preferably 48-68%.
In the present invention, after the step of cold rolling and before the step of peeling, a step of rolling may be further included as conventional in the art, the rolling operation may be a rolling operation as conventional in the art, and the diameter of the rolled material roll is preferably 1400 mm and 1800 mm, and more preferably 1500 mm.
In the present invention, the peeling operation may be a peeling operation as is conventional in the art. The unilateral peeling amount of the peeling is preferably 0.2-0.5mm, and more preferably 0.3 mm. The surface defects of the wire rod cannot be completely removed due to the excessively small peeling amount, and the surface of the material is scratched due to the excessively large peeling amount.
After the peeling operation and before the aging heat treatment, a rolling operation can be included as usual in the art, and the rolling operation can be a rolling operation as usual in the art, and the diameter of the rolled material roll is preferably 1400 mm and 1800 mm, and more preferably 1500 mm.
In the present invention, the aging heat treatment may be performed as is conventional in the art. The heating temperature in the aging heat treatment is preferably 420-480 ℃, and more preferably 460 ℃; the aging heat treatment comprises a heat preservation step, wherein the heat preservation time is preferably 2-5.5 hours, and more preferably 4 hours.
Wherein, after the heat preservation, the air cooling and the tapping cooling can be carried out according to the routine in the field. Preferably, after the temperature is reduced to 80 ℃, the mixture is taken out of the furnace and cooled to room temperature.
The equipment used for the aging heat treatment may be equipment conventionally used for the aging heat treatment in the art, such as a bell jar heat treatment furnace.
In the present invention, the cold drawing operation may be a cold drawing operation conventional in the art, and preferably the cold drawing passes are preferably 4 to 10 passes, and more preferably 4 passes.
In the present invention, after the cold drawing, the material size preferably meets the CTCZ150 contact line technical requirements, such as the cross-sectional area of 149.3-149.8mm, in the TB/T2809-.
The invention also provides the chromium-zirconium-copper alloy contact wire prepared by the preparation method.
In the present invention, the room temperature is generally 25. + -. 5 ℃.
In the invention, the chromium-zirconium-copper alloy contact line has the following characteristics:
the cross-sectional area is preferably 149.3-149.8 mm;
the transverse grain size is preferably 0.12-0.14 mm;
the tensile strength is preferably 588-605 MPa;
the conductivity is preferably 86-87%;
the elongation is preferably 9-10%;
the softening rate is preferably 95% or more, for example 96%;
resistivity is preferably 0.01982-0.02005 Ω · mm/m.
In the present invention, the electrical conductivity and the electrical resistivity are both measured at 20 ℃ according to TB/T2809-2017 copper and copper alloy contact line for electrified railways.
The invention also provides an application of the chromium-zirconium-copper alloy contact line in electrified railway equipment. The electrified railway equipment is preferably a network cable for an electrified railway.
The invention also provides a preparation method of the chromium-zirconium-copper ingot, which comprises the following steps:
the raw materials are subjected to down-leading semi-continuous casting to obtain the product;
the raw materials comprise the following components in percentage by mass: 0.2-1.0% of Cr, 0.02-0.2% of Zr and the balance of Cu; the Zr is added in the form of copper-zirconium intermediate alloy;
the downward drawing semi-continuous casting comprises the following steps:
smelting the Cr and the Cu to obtain molten liquid, wherein the smelting temperature is 1150-1300 ℃; and then adding the copper-zirconium intermediate alloy into the molten liquid, and carrying out casting and down-drawing casting to obtain the chromium-zirconium-copper cast ingot.
The invention also provides a chromium-zirconium-copper alloy ingot prepared by the preparation method of the chromium-zirconium-copper alloy ingot.
The above preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention without departing from the common general knowledge in the art.
The raw materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows: the method for preparing the chromium-zirconium-copper alloy contact line can continuously produce the chromium-zirconium-copper contact line for the electrified railway with various performances meeting the TB/T2809 and 2017 standard of copper and copper alloy contact lines for the electrified railway (the prepared copper-chromium draft contact line can realize the cross-sectional area of 149.3-149.8mm, the transverse grain size of 0.12-0.14mm, the tensile strength of 588 MPa and 605 MPa, the electric conductivity (20 ℃) of 86-87%, the elongation of 9-10%, the softening rate of not less than 95% and the resistivity (20 ℃) of 0.01982-0.02005 omega mm/m) through the cooperation of downward-leading semi-continuous casting, hot rolling, cold rolling and other steps, and can produce a single line with the weight of 2 tons, meet the requirements of more than 1.8 tons of the single line of the high-iron contact line and meet the unavailable welding point.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
In the embodiment, a production process is designed and produced according to the chromium-zirconium-copper contact line for the electrified railway, and performance detection is carried out after production is finished.
In this embodiment, taking TB/T2809 and 2017 standard "copper and copper alloy contact line for electrified railway" CTCZ150 contact line as an example, the preparation method of the chromium-zirconium-copper alloy contact line is as follows:
step one, downward drawing semi-continuous casting: 2764.72kg of electrolytic copper plate is added into a down-drawing semi-continuous casting furnace according to the mixture ratio, 25.2kg of metal chromium is added, 10.08kg of CuZr50 intermediate alloy is added after the mixture is heated to 1230 ℃ to be molten, and ingot casting with the diameter of 360mm is obtained through casting and down-drawing casting, wherein the casting temperature is 1200 ℃. The chemical composition of the cast ingot should meet the requirements of CTCZ in TB/T2809-. And turning the steel plate on a horizontal lathe to a diameter of 340mm to ensure that the surface has no casting defects.
Step two, forging: the ingot is heated to 920 ℃, and is forged into a square ingot with the thickness of 210mm multiplied by 210mm on a forging press, and the edge is chamfered with a R20 round corner. Milling the forged blank to the cross section size of 200mm multiplied by 200mm by a gantry milling machine to ensure that the surface is free of defects.
Thirdly, hot rolling: and adjusting the hole pattern of the rolling mill, wherein the final discharging diameter is 28 mm. Heating the cast ingot to 920 ℃ in a stepping heating furnace, rolling the cast ingot to a round bar with the diameter of 28mm by 22 passes of a hot rolling mill, and rolling the round bar to a material coil with the diameter of 1500mm by a rolling machine. The roller is cooled by water in the rolling process so as to prolong the service life of the roller.
Step four, solution heat treatment: and heating the hot rolled rod in a solution heat treatment furnace to 970 +/-20 ℃, preserving heat for 1-1.5h, discharging the hot rolled rod after the heat preservation time is up, cooling the hot rolled rod by water, and rapidly cooling the hot rolled rod to room temperature.
Step five, cold rolling: and adjusting the hole pattern of the rolling mill, wherein the final discharging diameter is 20mm, cold rolling the solid-dissolved chromium-zirconium-copper rod to 20mm in diameter by using a cold rolling mill for 8 times, and rolling the rod to a material roll with 1500mm in diameter by using a rolling machine. The roller is cooled by water in the rolling process so as to prolong the service life of the roller.
Sixthly, peeling off: the chromium-zirconium-copper rod produced by cold rolling is scalped by a scalping machine, the single-side scalping amount is 0.3mm, the surface is ensured not to have any defect influencing subsequent processing, and the chromium-zirconium-copper rod is wound into a material coil with the diameter of 1500mm by a winding machine.
Step seven, aging heat treatment: and carrying out aging heat treatment on the scalped chromium-zirconium-copper rod by using a bell jar type heat treatment furnace. The chromium-zirconium-copper rod is firstly arranged in a bell-type heat treatment furnace, then the heat treatment furnace is vacuumized, and argon is filled as protective atmosphere. The heating temperature is 460 ℃, and the holding time is 4 hours. And after the heat preservation time is up, air cooling is carried out on the bell jar furnace, and the bell jar furnace is taken out of the furnace and cooled to the room temperature after the temperature in the bell jar furnace is lower than 80 ℃.
Eighth, cold drawing: and (3) drawing the chromium-zirconium-copper rod subjected to aging heat treatment to the size meeting the technical requirement of the CTCZ150 contact line in the standard of TB/T2809-.
Example 2
In the embodiment, a production process is designed and produced according to the chromium-zirconium-copper contact line for the electrified railway, and performance detection is carried out after production is finished.
This example takes TB/T2809 and 2017 CTCZ150 contact line as an example in the copper and copper alloy contact line for electrified railways. The preparation method of the chromium-zirconium-copper alloy contact line comprises the following steps:
step one, downward drawing semi-continuous casting: 2765.88kg of electrolytic copper plate is added into a down-drawing semi-continuous casting furnace according to the mixture ratio, 24.6kg of metal chromium is added, 9.52kg of CuZr50 intermediate alloy is added after the mixture is heated to 1230 ℃ to be melted, and ingot casting with the diameter of 360mm is obtained through casting and down-drawing casting, wherein the casting temperature is 1200 ℃. The chemical composition of the cast ingot should meet the requirements of CTCZ in TB/T2809-. And turning the steel plate on a horizontal lathe to a diameter of 340mm to ensure that the surface has no casting defects.
Step two, forging: the ingot is heated to 925 ℃, and is forged into a square ingot with the thickness of 210mm multiplied by 210mm on a forging press, and the edge is chamfered with a round angle R20. Milling the forged blank to the cross section size of 200mm multiplied by 200mm by a gantry milling machine to ensure that the surface is free of defects.
Thirdly, hot rolling: and adjusting the hole pattern of the rolling mill, wherein the final discharge diameter is 28.2 mm. Heating the cast ingot to 925 ℃ in a stepping heating furnace, rolling the cast ingot to a round bar with the diameter of 28.2mm by a hot rolling mill through 22 passes, and rolling the round bar to a material coil with the diameter of 1500mm by a rolling machine. The roller is cooled by water in the rolling process so as to prolong the service life of the roller.
Step four, solution heat treatment: and heating the hot rolled rod in a solid solution heat treatment furnace to 965 ℃, preserving heat for 1h, discharging the hot rolled rod after the preservation time is up, cooling the hot rolled rod by water, and rapidly cooling the hot rolled rod to room temperature.
Step five, cold rolling: and adjusting the hole pattern of the rolling mill, wherein the final discharging diameter is 19.8mm, cold-rolling the solid-dissolved chromium-zirconium-copper rod to the diameter of 19.8mm by using a cold rolling mill for 8 times, and rolling the rod to a material coil with the diameter of 1500mm by using a rolling machine. The roller is cooled by water in the rolling process so as to prolong the service life of the roller.
Sixthly, peeling off: the chromium-zirconium-copper rod produced by cold rolling is scalped by a scalping machine, the single-side scalping amount is 0.3mm, the surface is ensured not to have any defect influencing subsequent processing, and the chromium-zirconium-copper rod is wound into a material coil with the diameter of 1500mm by a winding machine.
Step seven, aging heat treatment: and carrying out aging heat treatment on the scalped chromium-zirconium-copper rod by using a bell jar type heat treatment furnace. The chromium-zirconium-copper rod is firstly arranged in a bell-type heat treatment furnace, then the heat treatment furnace is vacuumized, and argon is filled as protective atmosphere. The heating temperature is 455 ℃, and the holding time is 4 hours. And after the heat preservation time is up, air cooling is carried out on the bell jar furnace, and the bell jar furnace is taken out of the furnace and cooled to the room temperature after the temperature in the bell jar furnace is lower than 80 ℃.
Eighth, cold drawing: and (3) drawing the chromium-zirconium-copper rod subjected to aging heat treatment to the size meeting the technical requirement of the CTCZ150 contact line in the standard of TB/T2809-.
Comparative example 1
The temperature in the down-drawing semi-continuous casting in example 1 was modified to 1050 ℃ and the same as in example 1 was conducted. Defects such as air holes, cracks, inclusions and the like are formed in the prepared cast ingot, and the defects can form broken lines when contact lines are produced subsequently.
Comparative example 2
The temperature of the hot rolling in example 1 was modified to 1000 ℃ and the same procedure as in example 1 was repeated. The prepared material is overheated and overburnt, and the material is broken during rolling.
Comparative example 3
The temperature of the hot rolling in example 1 was modified to 700 ℃ and the same process as in example 1 was repeated. The prepared chromium-zirconium-copper rod has the defects of cracks and the like, so that the line is broken in the subsequent cold rolling and drawing processes.
Comparative example 4
The same procedure as in example 1 was repeated, except that the cross-sectional deformation of the chromium-zirconium-copper rod after cold rolling in example 1 was changed to 40%. The cold rolling deformation is insufficient, and the strength of the finally prepared contact line is insufficient.
Effects of the embodiment
The Cr-Zr-Cu alloy contact wires prepared in the above examples were sampled and tested according to TB/T2809 and 2017 copper and Cu alloy contact wires for electrified railways, and the test results are shown in tables 1 and 2.
TABLE 1 chemical composition of the contact line of chromium zirconium copper alloy (the following% means the mass of the element in the mass percent of the contact line of chromium zirconium copper)
TABLE 2 Individual basis weights, Cross-sectional areas, mechanical, electrical and transverse grain sizes
Repeated experiments show that the prepared chromium-zirconium-copper alloy with large length has consistent performance, which shows that the preparation method provided by the invention has good reproducibility for the mass production of the copper alloy contact line for the electrified railway with qualified performance, and can realize continuous mass production.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The preparation method of the chromium-zirconium-copper alloy contact line is characterized by comprising the following steps of:
the raw materials are subjected to down-leading semi-continuous casting, forging, hot rolling, solution heat treatment, cold rolling, scalping, aging heat treatment and cold drawing; wherein the content of the first and second substances,
the raw materials comprise the following components in percentage by mass: 0.2-1.0% of Cr, 0.02-0.2% of Zr and the balance of Cu; the Zr is added in the form of copper-zirconium intermediate alloy;
the downward drawing semi-continuous casting comprises the following steps: smelting the Cr and the Cu to obtain molten liquid, wherein the smelting temperature is 1150-1300 ℃; then adding the copper-zirconium intermediate alloy into the molten liquid, and carrying out casting and down-drawing casting to obtain a chromium-zirconium-copper cast ingot;
in the step of hot rolling, the temperature of the hot rolling is 800-950 ℃;
in the cold rolling step, the cross-section deformation of the cold-rolled material is more than 48%.
2. The method for preparing a chromium-zirconium-copper alloy contact line according to claim 1, wherein the Cr is added in the form of metallic chromium;
and/or the Cu is added in the form of an electrolytic copper plate;
and/or the copper-zirconium intermediate alloy is a copper-zirconium intermediate alloy with 30-50% of zirconium content;
and/or the mass percent of the Cr is 0.8-0.9%;
and/or the mass percent of the Cu is 98-99%, and the mass part of the Cu in the raw material is from the mass of the copper in the copper-zirconium intermediate alloy;
and/or, the mass percent of Zr is 0.17-0.18%;
and/or in the downward drawing semi-continuous casting, the smelting temperature is 1230 ℃;
and/or in the downward-leading semi-continuous casting, the temperature during casting is 1100-1300 ℃;
and/or the equipment used for the downward drawing semi-continuous casting is a downward drawing semi-continuous casting furnace;
and/or the forging temperature is 850-950 ℃;
and/or the forging uses equipment of a forging press;
and/or the size of the material obtained after forging is 210mm multiplied by 210 mm;
and/or, after said forging, before said hot rolling, comprising a step of milling;
and/or the temperature of the hot rolling is 850-950 ℃;
and/or, the hot rolling equipment is a hot rolling mill;
and/or the hot rolling passes are 20-30;
and/or obtaining a chromium zirconium copper rod after the hot rolling, wherein the diameter of the chromium zirconium copper rod is 28-35 mm;
and/or, the hot rolling comprises a step of heating;
and/or, after hot rolling and before solution heat treatment, the method also comprises a rolling step;
and/or the temperature in the solution heat treatment is 970 +/-20 ℃;
and/or; the solution heat treatment comprises a heat preservation step, wherein the heat preservation time is 1-1.5 h;
and/or the number of cold rolling is 6-12;
and/or the diameter of the cold-rolled material is 20-25 mm;
and/or the cross-section deformation of the cold-rolled material is 48-68%;
and/or after the step of cold rolling and before the step of peeling, the step of rolling is further included;
and/or the unilateral peeling amount of the peeling is 0.2-0.5 mm;
and/or a rolling step is further included after the operation of peeling and before the aging heat treatment;
and/or the heating temperature in the aging heat treatment is 420-480 ℃;
and/or the aging heat treatment comprises a heat preservation step, wherein the heat preservation time is 2-5.5 h;
and/or the equipment used for the aging heat treatment is a bell-type heat treatment furnace;
and/or the cold drawing passes are 4-10;
and/or, after the cold drawing, the cross-sectional area of the material is 149.3-149.8 mm.
3. The method for preparing a chromium-zirconium-copper alloy contact line according to claim 2, wherein the copper-zirconium master alloy is a CuZr30 master alloy or a CuZr50 master alloy;
and/or the mass percent of the Cr is 0.878%;
and/or the mass percent of Cu is 98.92% or 98.952%; the mass of Cu in the raw material is partially derived from the mass of copper in the copper-zirconium master alloy;
and/or in the downward drawing semi-continuous casting, the temperature of the casting is 1200 ℃;
and/or the forging temperature is 920-925 ℃;
and/or the shape of the material obtained after forging is a square ingot;
and/or, when the step of milling the surface is included after the forging and before the hot rolling, wherein the equipment used for milling the surface is a planomiller;
and/or the temperature of the hot rolling is 920-925 ℃;
and/or the hot rolling passes are 22;
and/or obtaining the chromium-zirconium-copper rod after hot rolling, wherein the diameter of the chromium-zirconium-copper rod is 28-28.2 mm;
and/or, when the hot rolling comprises a step of heating; the heating equipment is a stepping heating furnace;
and/or, when a step of rolling is further included after the hot rolling and before the solution heat treatment; the diameter of the material roll obtained after winding is 1400-1800 mm;
and/or the number of cold rolling is 8;
and/or when the step of rolling is further included after the step of cold rolling and before the step of peeling, the diameter of the rolled material roll is 1400-1800 mm;
and/or the unilateral peeling amount of the peeling is 0.3 mm;
and/or when the step of rolling is further included after the operation of peeling and before the aging heat treatment, the diameter of the rolled material roll is 1400-1800 mm;
and/or the heating temperature in the aging heat treatment is 460 ℃;
and/or the heat preservation time in the aging heat treatment is 4 h;
and/or the aging heat treatment comprises a heat preservation step, and after the heat preservation, air cooling and discharging cooling are carried out;
and/or the cold drawing passes are 4.
4. The method for preparing a chromium-zirconium-copper alloy contact line according to claim 3, wherein the copper-zirconium master alloy is a CuZr50 master alloy;
and/or the square ingot is a square ingot with an edge with an inverted R20 round corner;
and/or, when the step of milling the surface is included after the forging and before the hot rolling, the cross-sectional dimension of the material obtained after the surface milling is 200mm x 200 mm;
and/or, when a step of rolling is further included after the hot rolling and before the solution heat treatment; the diameter of the material roll obtained after rolling is 1500 mm;
and/or when a rolling step is further included after the cold rolling step and before the peeling step, the diameter of the rolled material roll is 1500 mm;
and/or when the step of rolling is further included after the operation of peeling and before the aging heat treatment, the diameter of the rolled material roll is 1500 mm.
5. A contact line of chromium zirconium copper alloy prepared by the method for preparing a contact line of chromium zirconium copper alloy as claimed in any one of claims 1 to 4.
6. A Cr-Zr-Cu alloy contact wire according to claim 5, wherein said Cr-Zr-Cu alloy contact wire has the following characteristics: cross-sectional area 149.3-149.8 mm.
7. A Cr-Zr-Cu alloy contact wire according to claim 5, wherein said Cr-Zr-Cu alloy contact wire has the following characteristics: the transverse grain size is 0.12-0.14 mm.
8. A Cr-Zr-Cu alloy contact wire according to claim 5, wherein said Cr-Zr-Cu alloy contact wire has the following characteristics: the tensile strength is 588-605 MPa.
9. A Cr-Zr-Cu alloy contact wire according to claim 4, wherein said Cr-Zr-Cu alloy contact wire has the following characteristics: the conductivity is 86-87%; the elongation is 9-10%; the softening rate is more than or equal to 95 percent; resistivity of 0.01982-0.02005 omega mm/m.
10. Use of a chromium zirconium copper alloy contact wire according to any one of claims 5 to 9 in electric railway equipment.
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